Azolindolines and azolindoline dyestuffs

ABSTRACT

1. AZOLINDOLINE DYESTUFF OF THE FORMULA   1-R3,2-(R5-OOC-C(-CN)=CH-CH=),3-R1,3-R2,5-((-X-(W1,W2-   1,2-PHENYLENE)-N=)&gt;C-)-INDOLINE   WHEREIN W1 IS HYDROGEN, ALKYL OF 1-5 CARBON ATOMS, TRIFLUOROMETHYL, CHLOROETHYL, BROMOETHYL, HYDROXYETHYL. METHOXYETHYL, CYCLOHEXYL, PHENYL, CHLORO, ALKOXY OF 1-5 CARBON ATOMS, METHYLSULFONYL, ETHYLSULFONYL, DIMETHYLAMINOSULFONYL, DIETHYLAMINOSULFONYL, DIMETHYLAMINOCARBONYL, DIETHYLAMINOCARBONYL, METHOXYCARBONY, ETHOXYCARBONYL, B-METHOXYETHOXYCARBONYL, ACETYLAMINO, PROPIONYLAMINO, OR METHYLSULFONYLAMINO, W2 IS HYDROGEN, OR ALKYL OF 1-5 CARBON ATOMS, W1 AND W2 ADDITIONALLY CAN BE JOINED TOGETHER TO PRODUCE A FUSED BENZENE RING, R1 AND R2 SEPRATELY ARE METHYL OR ETHYL, OR CAN BE JOINED TOGETHER TO PRODUCE A CYCLOPENTYL OR A CYCLOHEXYL RING, R3 IS ALKYL OF 1-5 CARBON ATOMS, CHLOROETHYL, BROMOETHYL, FLUOROETHYL, CYANOETHYL, ALLYL, BENZYL OR PHENBENZYL, OR PHENYLETHYL, R5 IS ALKYL OF 1-5 CARBON ATOMS, CHLOROETHYL, HYDROXYETHYL, METHOXYETHYL, CYANOETHYL, ALLY, BENZYL OR PHENYLETHYL, AND X IS OXYGEN SULFUR.

S e Patent US. Cl. 260307 D Claims ABSTRACT OF THE DISCLOSURE Azolindolines of the formula N R1 R: A I W C H-Z N r wherein Z represents hydrogen or an optionally modified aldehyde R and R denote alkyl or represent the remaining members of a cycloalkyl radical,

R denotes alkyl or aralkyl,

X represents oxygen, sulphur or -NR wherein R denotes hydrogen or alkyl, cycloalkyl or aralkyl, and A represents the remaining members of an aromatic radical,

as well as their preparation, and, moreover, compounds of the formula wherein A, X, R R and R have the same meaning as above and R denotes alkyl or aralkyl as well as their preparation and their use for the dyeing of synthetic fibre materials.

The subject of the present invention are azolindolines of the general formula wherein Z represents hydrogen or an optionally modified aldehyde R and R denote alkyl radicals or represent the remaining members of a cycloalkyl radical,

R denotes an alkyl or aralkyl radical,

X represents oxygen, sulphur or =NR wherein R denotes hydrogen or an alkyl, cycloalkyl or aralkyl radical, and

. ice

A represents the remaining members of an aromatic radical,

as well as processes for their manufacture.

By modified aldehyde groups there are especially to be understood acetals, hydrates, ammoniates, aminals, bisulphite adducts, azomethines and hydrazones.

Possible aromatic radicals of which the remaining members are designated A, are both radicals of monocyclic ring systems and radicals of bicyclic ring systems, which" can be built up of aromatic-carbocyclic and/or aromaticheterocyclic rings in any desired fusion arrangement, and which can optionally also contain fused-on partially saturated, five-membered or siX-membered rings.

As examples of such aromatic radicals there may, for example, be mentioned: the radicals of benzene, naphthalene, tetralin, indane, acenaphthene, pyridine, quinoline, pyrimidine, quinoxaline and indazole. Carbocyclic radicals are preferred.

These aromatic radicals can also possess substituents, such as halogen, cycloalkyl, aralkyl, phenyl, alkyl, alkoxy, alkylsulphonyl, aralkylsulphonyl, dialkylaminosulphonyl, alkoxycarbonyl, dialkylaminocarbonyl and acylamino radicas.

By the above-mentioned alkyl radicals there are preferably to be understood those with 1 to 5 C atoms, which can possess further substituents, such as halogen, hydroxyl and alkoxy. Suitable alkyl radicals of this nature are, for example, methyl, trifluoromethyl, ethyl, chloroethyl, bromoethyl, hydroxyethyl, methoxyethyl, n-propyl, isopropyl and n-, iand t-butyl.

Suitable aralkyl radicals are especially the benzyl radical and the phenylethyl radical.

A suitable cycloalkyl radical is, for example, the cyclohexyl radical. Suitable alkoxy radicals are above all those with 1 to 5 C atoms. As alkylsulphonyl radicals, the methylsulphonyl and ethylsulphonyl radical should especially be mentioned, and as aralkylsulphonyl radicals the benzylsulphonyl radical should especially be mentioned. Suitable dialkylaminosulphonyl and dialkylaminocarbonyl radicals are preferably those which contain methyl and ethyl groups.

As alkoxycarbonyl radicals, the methoxycarbonyl, ethoxycarbonyl and ,B methoxy-ethoxycarbonyl radicals should for example be mentioned.

Suitable acylamino radicals are, for example, acetylamino, propionylamino and methylsulphonylamino radicals.

Preferred alkyl radicals R and R are methyl and ethyl radicals. Suitable cycloalkyl radicals which can be formed by R and R together are cyclohexyl and cylopentyl radicals.

Suitable alkyl radicals R and R are, for example, alkyl or alkenyl radicals with 1 to 5 atoms, which can also possess further substituents, such as halogen, hydroxyl, alkoxy, nitrile, alkylcarbonyl, benzoyl and alkoxycarbonyl radicals. Suitable alkyl radicals of this nature are, for example, methyl, ethyl, chloroethyl, bromoethyl, fluoroethyl, cyanoethyl, methoxyethyl, allyl, n-propyl, isopropyl, e-hydroxybutyl, acetonyl, phenacyl, methoxycarbonylethyl and n-butyl. Methyl and ethyl radicals are preferred.

The new azolindolines of the formula (I) are accessible according to various processes. One of these processes is characterised in that azolindolenines of the formula A, X, R and R have the above-mentioned meaning, are

' first reacted with alkylating agents or aral-kylating agents togive compounds of the formula LRI R2 (III) wherein I ka wherein A, X, R R and R have the above-mentioned meaning, and these are, if desired, reacted according to frmyla tion methods which are in themselves known to give aldehydes of the formula N R2 W \X oil-CHO wherein A, X, R R and R have the above-mentioned meaning.

It must be described as distinctly surprising that the reaction, according to the invention, of (II) with alkylating agents to give (III) takes place selectively at the indolenine nitrogen and that practically no quaternisation of the azole nitrogen occurs. This unforeseeable effect is of decisive importance because with quaternary azoles there is the danger, especially under alkaline conditions, of hydrolytic ring opening.

In carrying out the quaternisation, an appropriate procedure is to react approximately equimolar amounts of the reactants in a solvent which is inert under the reaction conditions, such as benzene, toluene, chlorobenzene, odichlorobenzene, chloroform, carbon tetrachloride, dioxane, ethyl acetate or acetonitrile, with one another at temperatures between 25 and 130 C.

Suitable azolindolenines of the formula (II) are, for example:

2,3,3-trimethyl-5-[5'-methyl-benzoxazolyl-(2') indolenine, 2,3,3-trimethyl-5- [5 '-chloro-benzoxazolyl- 2') indolenine, 2-methy1-3,3-diethyl-5- [5 -trifiuoromethyl-benzoxazoly- (2' -indolenine, 2,3-dimethyl-3-ethyl-5- [5 '-cyclohexyl-benzoxazolyl- (2) -indo1enine, 2,3,3-trimethyl-5-[5'-phenyl-benzoXazolyl-(2') indolenine, 2,3 ,3-trin1ethyl-5- 5 -methoXy-benzoxazolyl- (2') indolenine, 2,3 ,3-trimethyl-5- [5 ',6'-dimethyl-benzoxazolyl- (2') indolenine, 2,3,3-trimethyl-5-[5-br0mQb ZQ Z y 1- indolenine,

indolenine,

2,3,3-trimethyl-5-[5'-fluoro-benzoxazolyl-(2' indolenine, p

2,3,3 ,-trimethyl-5- [5 '-ethyl-b enz'oxazolyl-;( 2') indolenine,

2,3,3-trimethyl-5-[5'-ethylsulphonyl-benzoxazolyl-(2') indolenine,

2,3 ,3-trimethyl-5- 5 '-dimethylaminosulphonylbenzoxazolyl- 2' ]-indolenine,

H indolenine, v V

2,3,3-trimethyl-5- [5 '-acetylamino-benzoxazolyl- (2') indolenine,

2,3 ,3-trimethyl-5- 5 '-;8-hydroxyethyl-benzoxazolyl- 2') indolenine,

2, 3 ,3-trimethy1-5- [5-benzyl-benzoxazolyl- (2') indolenine, I

2-methyl-3, 3-pentamethylene-fibenzoxazolyl- 2' indolenine, I

2,3 ,3 -trimethyl-5- [5'-/3-phenylethyl-benzoxazolyl- (2) indolenine,

2,3 3 -trimethyl-.5 [5 -13-chloroethyl-benzoxazolyl- (2' indolenine,

2, 3 3 -trimethyl-5- [5 -methylsulphonyl-b enzoxazolyl- (2) ]-indolenine,

2,3 ,3-trimethyl-5- [5 '-diethylaminosulphonyl-benzoxazolyl- (2') ]-indolenine,

2,3,3-trimethyl-5-[5'-methylsulphonylamino=benzoxazolyl- (2') ]-indolenine,

2,3,3-trimethyl-5- [5 'benzylsulphonyl-benzoxazolyl- 2') I 2,3,3-trimethyl-5- [5 '-diethylarninocarbonyl-benzoxazolyl- (2') ]-indolenine,

2, 3 3-trimethyl-5- [5 '-methoxy-carbonyl-benzoxazolyl- (2') J-indolenine,

2,3,3,-trirnethyl-5- [5 '-fl-methoxy-ethoxycarbonyl- "benzoxazolyl- 2) ]-indolenine,

2,3 3-trimethyl-5- 5 -propionylamino-benzoxazolyl- (2') J-indolenine,

2,3,3-trimethyl-S- 5 ',6'-tetramethylene-benzoxazolyl- (2) ]-indolenine,

2,3,3-trimethyl-5- 5,6'-trimethylene-benzoxazolyl- (2' indolenine,

2,3,3-trimethyl-5-naphth 1,2-d)-oxazolyl-(2')-indolenine,

2,3 ,3-trimethyl-5-oxazolo 5,4-b -pyridine- (2 indolenine,

2,3 ,3-trimethyl-5-oxazolo (4,5-g) -quinoline- 2' indolenine,

2,3 ,3-trimethyl-5-oxazolo (4,5-c) -quinoline- (2' indolenine,

2,3,3-trimethyl-5-oxazolo (4,5-d) -pyridazine- (2' indolenine,

2,3 ,3-trimethyl-5-oxazolo (4,5-d) -quinoxaline- (2') indolenine,

2,3,3-trirnethy1-5 -oxazolo 5 ,4-d) -pyrimidine- (2 indolenine,

2,3 ,3-trimethyl-5-acenaphth(5,4-d) oxazolyl- 8') indolenine,

2,3,3-trimethyl-S-benzirnidazolyl- 2' -indolenine,

2,3,3-trimethy1-5- 1'-methyl-benzimidazolyl- 2') indolenine,

2-methyl-3,3-diethyl-5- 1-ethyl-5'-methylbenzimidazolyl- (2) ]-indolenine,

2,3,3-trimethyl-5- [5 -ethoxybenzimidazolyl- (2') indolenine,

2,3 ,3-trimethyl-5-imidazolo- (5,4-d) pyrimidine-(2' indolenine,

2,3 ,3-trimethyl-5- [6 '-methyl-benzthiazolyl-( 2') indolenine,

2,3 ,3-trimethyl-5- Gmethoxy-bengthiazolyl- (2') indQlenine, and v 5 2,3 ,3-trimethyl-5- [5-chloro-benzthiazolyl- (2) indolenine.

formula wherein A and X have the above-mentioned meaning under the customary conditons of the azole synthesis.

N 1 NH NH,

in which A and X have the above-mentioned meaning, with ketones of the formula (VII) /R1 CHa- -CH R1 (VIII) in which R and R have the above-mentioned meaning, in the presence of zinc chloride, at elevated temperatures, in a manner which is in itself known.

Suitable alkylating agents and aralkylating agents for the conversion, according to the invention, of compounds of the formula (II) into those of the formula (HI) are, for example, alkyl halides, such as methyl iodide, ethyl bromide, n-propyl bromide, i-propyl chloride, alkyl bromide, n-butyl bromide and isoamyl chloride, sulphuric acid esters of lower alkanols, such as dimethyl sulphate or diethyl sulphate, aromatic sulphonic acid esters, such as p-toluenesulphonic acid methyl ester and ethyl ester, and m-chlorobenzenesulphonic acid ethyl ester, and substituted alkyl halides, such as B-chloropropionitrile, 4-hy droxybutyl bromide, phenylethyl bromide, benzyl chloride, p-chlorobenzyl chloride, p-methoxybcnzyl chloride, p-cyanobenzyl chloride, phenylacyl chloride, chloroacetic acid methyl ester, fi-chloropropionic acid ethyl ester and fi-bromopropionic acid dimethylamide. Dimethyl sulphate and diethyl sulphate are particularly preferred.

The liberation of the azolindolenine-methylene bases of the formula (IV) from the corresponding salts of the formula (III) is achieved in a manner which is in itself known by dissolving the salts of the formula (III), for example in water, and precipitating the methylene base by adding alkali.

The new methylene bases of the formula (IV) are distinguished in that in contrast to most known 1,3,3-trimethyl-Z-methylene-indolines they are not obtained as oils which are sensitive to air, but as crystalline substances of relatively good stability, and can hence be isolated particularly easily and conveniently processed further.

The methylene bases of the formula IV can be converted in accordance with formylating methods which are in themselves known into the azolindoline-w-aldehydes of the formula (V), accordingto the invention. This reaction can be carried out particularly simply and smoothly if the formylation is carried out according to the Vilsmeier method. Suitable Vilsmeier formylating mixtures are for example obtained if phosphorus oxychloride, phosgene or thionyl chloride are reacted with tertiary formamides, such as dimethylformamide or N-formyl-N- methyl-aniline; a mixture of equimolar amounts of phos phorus oxychloride and dimethylformamide is preferred. Excess dimethylformamide or acetonitrile can for example serve as the solvent and diluent. The reaction temperatures can be varied over a major range without the result being changed significantly. The process is advantageously carried out at between 30 and C., preferably at 35-60 C.

The azolindolines of the formula (I) are valuable new intermediate products for methine dyestuffs, which are distinguished by particularly high colour strength, high clarity, excellent afiinity, outstanding fastness to sublimation and very good fastness to light, rubbing, perspiration and washing, these being properties which the methine dyestuffs hitherto proposed do not possess to the same extent.

A particularly valuable class of azolindolines within the framework of the formula (I) corresponds to the formula wherein W represents hydrogen, alkyl, cyclohexyl, phenyl, chlorine, alkoxy, alkylsulphonyl, dialkylmaniosulphonyl, alkoxycarbonyl or acylamino,

W represents hydrogen or alkyl, with the alkyl and alkoxy radicals having 1 to 5 C atoms,

W and W can additionally together represent the remaining members of a fused S-membered or 6-membered cycloaliphatic ring or of a benzene ring,

W and W independently of one another represent methyl or ethyl groups,

R denotes an alkyl radical, and

Z denotes hydrogen or an aldehyde group.

A further subject of the present invention are azoindoline dyestuffs of the general formula R and R denote alkyl radicals or represent the remaining members of a cycloalkyl radical,

R denotes an alkyl or aralkyl radical,

R denotes an alkyl or aralkyl radical,

X represents oxygen, sulphur or -=NR wherein R denotes hydrogen or an alkyl, cycloalkyl or aralkyl radical, and

A represents the remaining members of an aromatic radical,

as well as processes for their manufacture and their use.

The more exact meaning of the radicals R R R R and A has been given above.

Amongst the alkyl radicals R there should preferably be mentioned those with 1 to 5 C atoms, which can possess further substituents, such as halogen, hydroxyl, alkoxy and nitrile. Suitable al'kyl radicals of this nature are, for example, methyl, ethyl, chloroethyl, hydroxyethyl, methoxyethyl, cyanoethyl, n-propyl, isopropyl and n-, iand t-butyl, and allyl. 7

Suitable aralkyl radicals R are especially the benzyl radical and the phenylethyl radical.

The new azolindoline dyestuffs of the formula (1) are obtained if aldehydes of the formula A, X, R R and R have the above-mentioned meaning, are condensed with a cyanoacetic acid ester of the formula GEN wherein R has the above-mentioned meaning.

The condensation is carried out in the presence or absence of a solvent or diluent, preferably with the addition of an alkaline catalyst, at elevated temperature, preferably in the range of 60120 C.

Suitable solvents or diluents are those which are inert under the conditions of the condensation and are capable of adequately dissolving the reactants, and from which the reaction products separate out well. For example, methanol, ethanol, Z-methoxyethanol, isopropanol, dioxane, benzene, toluene, chlorobenzene, chloroform and pyridine are used.

As alkaline catalysts, sodium hydroxide, potassium, carbonate and sodium acetate should for example be mentioned, secondary organic bases, such as diethylamine, and especially pyrrolidine or piperidine, being preferred.

The reactants can be employed in a molar ratio, but an approximately 5% excess of the cyanoacetic acid ester component (3) is advantageous. It is also possible to choose a larger excess of cyanoacetic ester without thereby having an adverse effect on the course of the reaction.

Suitable aldehydes of the formula (2) are, for example:

1, 3 ,3-trimethyl-5- [5 '-methyl-benzoxazolyl- (2') ]-2- methylene-indoline-w-aldehyde,

1-ethyl-3,3-dimethyl-5- 5 '-chlorobenzoxazolyl- (2) Z-methyIene-indoline-w-aldehyde,

1-chloroethyl-3 3 -dimethyl-5- 5-trifiuorometl 1yl-benzoazolyl- 2') ]-2-methylene-indoline-li -aldehyde,

1-n-propyl-3 3-dimethyl-5- 5 '-cyclohexyl-benzoxazolyl- 2) -2-methylene-indoline-m-aldehyde,

1-allyl-3,3-dimethyl-5- [5'-phenyl-benzoxazolyl- (2') Z-methylene-indolinew-aldehyde,

1-n-butyl-3 ,3 -dimethyl-5- 5 -methoxy-benzoxazolyl- (2') ]-2-methylene-indo1ine-w-aldehyde,

1-methyl-3 3 entamethyIene-S-b enzoxazolyl- (2') Z-methylene-indoline-w-aldehyde,

l-cyanoethyl-3,3-dimethyl-5- [5 ',6'-dimethyl-benzoxazolyl- (2') -2-methylene-indoline-w-aldehyde,

l-B-ethoxycarbonylethyl-3,3-dimethyl-5- 5 '-ethylsulphonyl-b enzoxazolyl- 2) ]-2-methylene-indolinew-aldehyde,

l- 3-dimethylaminocarbonylethyl-3 ,3-dimethyl-5- [5 '-dimethylaminosulphonyl-benzoxazolyl- (2) ]-2-methylene-indoline-w-aldehyde,

1,3,3-trimethyl-5- [5'-[i-bromoethyl-benzoxazolyl- (2') Z-methylene-indoline-w-aldehyde,

1,3 ,3-trimethy1-5- [5'-acetylamino-benzoxazolyl- (2') Z-methylene-in doline-w-aldehyde,

1,3 ,3-trimethyl-5- [5'-chloroethyl-benzoxazolyl- (2') 2-methylene-indoline-w-aldehyde,

1,3,3-trimethyl-5- [5'-benzyl-benzoxazolyl- (2') ]-2- methylene-indoline-tit-aldehyde,

1,3,3-trimethyl-5- [5'-B-phenylethyl-b enzoxazolyl- 2') 2-methylene-indoline-w-aldehyde,

1,3,3-trimethyl-5- [5 '-methoxycarbonyl-benzoxazolyl- 2') ]-Z-methylene-indoline-w-aldehyde,

1,3 ,3-trimethyl-5- [5 '-diethylamino-carbonyl-benzoxazolyl- 2') ]-2-methylene-indoline-w-aldehyde,

1,3,3-trimethyl-5- [5 /3-methoxy-ethoxycarbonyl-benzoxazolyl- (2) ]-2-methylene-indoline-w-aldehyde,

1,3 ,3-trimethyl-5- 5',6'-tetramethylene-benzoxazolyl- (2') ]-2-methylene-indoline-w-aldehyde,

1,3 ,3 -trimethyl-5- [5',6'-trimethylene-benzoXaz01yl- 2') ]-2-methylene-indoline-w-aldehyde,

1, 3 ,3-trimethyl-5-naphth( 1,2-d oxazolyl- (2' -2-methylene-indoline-a-aldehyde,

1,3,3-trimethyl-5-oxazolo 5,4-b pyridine- 2' -2-methy1- ene-indoline-w-aldehyde,

1,3 ,3-trimethyl-5 -oxazol0 4,5 -g) quinoline- (2 -2- methylene-indoline-w-aldehyde,

1,3 ,3-trimethyl-5 -oxoazolo 4,5 -d pyridazine- 2' -2- methylene-indoline-w-aldehyde,

1,3 ,3 -trimethyl-5 -oxazolo (4,5 -d) quinoxaline- (2' 2-methylene-indoline-w-aldehyde,

1,3, 3-trimethyl-5-oxazolo 5 ,4-d pyrimidine- (2' -2- methylene-indolinew-aldehyde,

1,3,3-trimethyl-5-acenaphth 5,4-d) oxazolyl- 8) -2- methylene-indoline-w-aldehyde,

1,3,3-trimethyl-5-[ 1'-methyl-benzimidazolyl- (2') 2-methylene-indoline-m-aldehyde,

1, 3 3 -triethyl-5- 1 '-/3-cyanoethyl-5 '-methyl-b enzimidazoly1-(2') -2-m ethylene-indolinew-aldehyde,

1,3,3-trimethyl-5- [5'-ethoxy-1-ethyl-benzirnidazolyl- 2') ]-2-methylene-indoline-w-aldehyde,

1,3,3-trimethyl-5 -imidazolo 5 ,4-d pyrimidine- 2) -2- methtylene-indoline-w-aldehyde,

1,3,3-trimethyl-S- 6'-methyl-benzthiazoly1- (2) ]-2- methylene-indoline-w-aldehyde,

1,3 ,3-trimethyl-5- 6'-methoxy-benzthiazolyl- 2') 2-methylene-indoline-w-aldehyde, and

1,3,3-triethyl-5- 5'-chloro-benzthiazolyl-(2') ]-2- methylene-indoline-waldehyde.

Suitable cayanoacetic acid esters of the formula (3) are, for example: cyanoacetic acid methyl ester, cyanoacetic acid ethyl ester, cyanoacetic acid B-methoxy-ethyl ester, cyanoacetic acid fl-chloroethyl ester, cyanoacetic acid ,B-cyanoethyl ester, cyanoacetic acid fi-hydroxyethyl ester, cyanoacetic acid n-propyl ester, cyanoacetic acid isopropyl ester, cyanoacetic acid allyl ester, cyanoacetic acid n-butyl ester, cyanoacetic acid isobutyl ester, cyanoacetic acid isoamyl ester, cyanoacetic acid benzyl ester, cyanoacetic acid ,B-phenylethyl ester and cyanoacetic acid p-methoxy-benzyl ester.

A particularly valuable class of azolindoline dyestuffs within the framework of the formula (I) corresponds to the formula wherein W represents hydrogen, alkyl, cyclohexyl, phenyl, chlorine, alkoxy, alkylsulphonyl, dialkylaminosulphonyl, alkoxycarbonyl or acylamino,

W represents hydrogen or alkyl, While the alkyl, and

alkoxy radicals having 1-5 C atoms, and

wherein The new azolindoline dyestuffs of the formula (1) are in particular suitable for dyeing and printing synthetic fibre materials and fabric materials such as, for example, polyesters, but preferably materials of synthetic polyamides and polyurethanes.

These dyestuffs produce, on the fibres and fabrics mentioned, extraordinarily brilliant dyeings in yellow 3 shades, which are distinguished by particularly high colour strength, very good build-up capacity and afiinity and excellent fastness properties, such as fastness to washing, rubbing, sublimation, perspiration, exhaust gas and 4 light.

The yellow dyestuffs hitherto proposed do not possess these advantageous properties to the same extent. As against the nearest comparable methine dyestuffs (German Patent Specification 1,172,387 and French Patent Specification 1,460,912), the significantly higher colour strength, the better clarity of shade, the better afiinity and the better fastness to sublimation on polyamides should be singled out.

The new dyestuffs of the formula 1) can be used for dyeing and printing in accordance with customary processes, for example in the form of aqueous dispersions or printing pastes. The dyebaths and printing pastes can contain the customary dyeing auxiliary additives, such as levelling agents, dispersing agents and dyeing accelerators.

The new dyestuffs can also be dyed advantageously from organic solutions, for example from solutions in which solvents which are immiscible with Water are used, such as tetrachloroethylene, trichloroethylene, 1,1,2-trichloroethane or 1,1,1-trichloropropane.

The parts indicated in the Examples which follow are parts by weight unless otherwise indicated, and the degrees of temperature indicated are degrees centigrade.

Example 1a A mixture of 260 parts of 3-amino-4-hydroxy-toluene, 406 parts of 2,3,3-trimethyl-indolenine-5-carboxylic acid and 20 parts of boric acid is heated for 1 hour to 180- 190 in a slight stream of nitrogen, whilst distilling olf some liquid, and is subsequently heated for a further 40 minutes to 230. The melt is then fractionally distilled in vacuo, whereupon first of all the water formed and excess 3-amino-4-hydroxy-toluene pass over under a waterpump vacuum. Thereafter, the following fractions are obtained:

10 First runnings: 30 parts, 170/2.5 mm. Hg. Main fraction: 420 parts, l7240/0.1 mm. Hg. (bath temperature not exceeding 270).

CH3 CH:

all- Using the appropriate starting materials, the following compounds are obtained analogously: 2,3,3-trimethyl-5- [5 -chloro-benzoxazolyl- (2') indolenine, 2-methyl-3,3-diethyl-5- [5'-trifiuoromethyl-benzoxazolyl- (2') J-indolenine,

2,3 xiimethyl-3 -ethyl-5- [5 '-cyclohexyl-benzoxazoly1- (2) ]-indolenine, 2,3,3-trimethyl-5- 5-phenyl-benzoxazo1yl-(2) indolenine,

2,3 ,3-trimethyl-5- 5-methoxy-benzoxazolyl-( 2') indolenine,

2,3,3-trimethyl-5-[5',6-dimethyl-benzoxazolyl-(2') indolenine,

2, 3 ,3 -trimethyl-5- 5 -bromobenzoxazolyl- (2') indolenine,

2,3 ,3-trimethyl-5- [5'-tertiary-butylbenzoxazolyl- (2' indolenine,

2,3,3-trimethyl-5-[5'-fiuorobenzoxazolyl- (2') indolenine,

2,3,3-trimethyl-5- [5'-ethylbenzoxazolyl- (2') indolenine,

2,3,3-trimethyl-5- [5-ethylsulphonyl-benzoxazolyl- (2') indolenine,

2,3 3 -trimethyl-5- 5-dimethylaminosulphonyl-b enzoxazolyl- 2 -indolenine,

2,3,3-trimethyl-5- [5'-,B-bromoethyl-benzoxazolyl- (2) indolenine,

2,3,3-trimethyl-5- [5'-acetylamino-benzoxazolyl-(2') indolenine,

2,2,3-trimethyl-S- [5'-/3-hydroxyethyl-benzoxazolyl-(2') indolenine,

2,3,3-trimethyl-5-[5'-benzyl-benz0xazolyl-(2') indolenine,

2-methyl-3,3-pentamethylene-S-benzoxazolyl- (2') indolenine,

2,3 3 -trimethyl-5- [5 '-fl-phenylethyl-benzoxazolyl- 2) -indolenine,

2,3 3 -trimethyl-5- [5 '-,B-chloroethyl-b enzoxazolyly- (2) ]-indolenine,

2,3 ,3-trin1ethyl-5- [5-methylsulphonyl-benzoxazolyl- (2) ]-indolenine, 2,3,3-trimethyl-5-[5-diethylaminosulphonyl-benzoxazolyl- (2') ]-indolenine,

2, 3 3 -trimethyl-5- [5 -methylsulphonylamino-benzoazolyl- (2) ]-indolenine,

2, 3 ,3 -trimethyl-5- [5 -benzylsulphonyl-benzoxazolyl- (2) ]-indolenine,

2,3 ,3 -trimethyl-5- [5 3rnethoxyethylbenzoxazolyl- (2') ]-indolenine, 2,3,3-trimethyl-5- [5'-diethylaminocarbonyl-benzoxazolyl- (2') ]-indolenine,

2, 3 ,3 -trimethyl-5- [5 '-methoxycarb onyl-benzoxazolyl- 2') ]-indolenine,

2,3 3-trimethyl-5- [5 '-,6-m ethoxy-ethoxycarbonyl-benzoxazolyl- 2') ]-indolenine, 2,3,3 -trirnethyl-5- [5'-propionylamino-benzoxazolyl- (2) ]-indolenine, 2,3,3-trimethyl-5- [5 ',6'-tetramethylene-benzoxazolyl- (2') ]-indolenine,

2,3 ,3 -trimethyl-5- [5 6 -trimethylene-b enzoxazolyl- (2) ]-indolenine,

2,3,3-trimethyl-5-naphth( 1,2-d oxazolyl- 2 -indolenine,

2,3,3-trimethyl-5-oxazolo 5,4-b pyridine-( 2' indolenine,

2,3 ,3-trimethyl-5 -xazolo 4,5 -g) quinoline- (2 indolenine,

2,3,3-trimethyl- -oxazolo (4,5 -c) quinoline- (2' indolenine,

2,3,3-trimethyl-5 -oxazolo( 4,5 -d pyridazine- 2 indolenine,

2,3 ,3-trimethyl-5-oxazolo (4,5-d) quinoxaline- (2' indolenine,

2, 3 ,3-trimethyl-5-oxazolo (5,4-d pyrimidine- 2' indolenine,

2,3,3 -trimethyl-5-acenaphth (5,4-d oxazolyl- 8 indolenine,

2,3,3-trimethyl-S-benzimidazolyl- (2 -indolenine,

2,3 ,3 -trimethyl-5 [1'methyl-benzimidazoly1-(2') indolenine,

2-methyl-3,3-diethyl-5- 1'-ethyl-5'-methyl-benzimidazolyl- (2') -indolenine,

'2, 3 3 -trimethyl-5- [5 '-ethoxy-b enzimidazolyl- (2) indolenine,

2,3,3-trimethyl-5-imidazolo 5,4-d pyrimidine- (2 indolenine,

2,3,3-trimethyl-5- 6-methyl-benzthiazolyl- (2' indolenine,

2, 3 ,3 -trimethyl-5- 6'-methoxy-benzthiazolyl- (2) indolenine, and

2,3,3-trimethyl-5- 5 '-chloro-benzthiaz0lyl- (2') indolenine.

Example 2a 419.5 parts of the compound of the formula (la) (main fraction of Example 1a) are dissolved in 2700 parts by volume of chlorobenzene, with warming. 200 parts by volume of chlorobenzene are then distilled off in a waterpump vacuum. Thereafter 181 parts of dimethyl sulphate are added dropwise at 50 to 60, without further heating, and occasional short cooling with cold water may be necessary. When the exothermic reaction has subsided, the batch is further heated to 55-60 for 3 hours. After cooling, the crystalline precipitate is filtered off and washed with about 400 parts by volume of chlorobenzene. The resulting of the formula CH3 CH CH (2a) can be further processed whilst moist with chlorobenzene. If the substance is dried in vacuo at 70 in order to determine the yield, 470 parts of melting point 184-192 (decomposition) are obtained. A sample of the substance manufactured from recrystallised intermediate product melts at 283", with decomposition.

Thereafter, the quaternary salt which is moist with chlorobenzene is dissolved in 5400 parts of water at 40 and the chlorobenzene is distilled off azeotropically in vacuo, until the distillate which passes over is no longer cloudy. The solution is subsequently clarified at 40 with parts of active charcoal, and is filtered. 740 parts of strength sodium hydroxide solution are slowly run into the filtrate, whilst stirring, whereupon an almost colourless, crystalline precipitate separates out. This is filtered oif, washed with water until neutral and dried in vacuo at 243 parts-of the compound of the formula of melting point 153-156 (decomposition) are obtained.

Dilute solutions of the substance in organic solvents, such as alcohol, toluene or dimethylformamide show a strong blue fluorescence. In contrast to most known 1,3,3-trimethyl Z-methylene-indolines, this compound has relatively good stability to atmospheric oxygen.

If, instead of dimethyl sulphate, an equimolar amount of diethyl sulphate is employed and the quaternisation is carried out for 10 hours at 70, then the compound of the formula CH3 CH3 1,3,3-trimethyl-5-[5'-phenyl-benzoxazolyl- (2') ]-2- methylene-indoline,

1,3,3-trimethyl-5- [5'-methoxy-b enzoxazolyl- 2') ]-2- methylene-indoline,

1,3,3-trimethyl-5- [5 -bromobenzoxzolyl- (2-] -2- methylene-indoline,

1-ethyl-3,3-dimethyl-5- [5 ',6-dimethyl-benzoxazolyl- (2') ]-2-methylene-indoline,

1,3, 3-trimethyl-5- 5 '-tertiary-butyl-benzoxazolyl- 2') ]-2- methylene-indoline,

1,3,3-trimethyl-5- 5'-fluoro-benzoxazolyl- (2') ]-2-methylene-indoline,

1,3,3-trimethyl-5- [5 -ethyl-benzoxazolyl- (2') ]-2-methylene-indoline,

1-ethyl-2,3-dimethyl-5- 5'-ethylsulphonyl-benzoxazolyl- (2') ]-2-methylene-indoline,

1,3,3-trimethyl-5 [5 '-dimethyl amino sulphonylbenzoxazolyl- (2) J-Z-methylene-indoline,

1,3,3-trimethy1-5 [5 '-methoxycarbonyl-benzoxazolyl- 2') ]-2-methylene-indoline,

1,3,3-trimethyl-5- [5 '-benzyl-benzoxazolyl- (2) 1 -2- methylene-indoline,

1,3,3-trimethyl-5- [5 '-diethylaminocarbonyl-benzoxazolyl- (2) ]-2-methylene-indoline,

1,3,3-trimethyl-5- [5, '-tetramethylene-benzoxazolyl- (2') ]-2-methylene-indoline,

1,3,3-trimethyl-5- [5 ,6'-trimethylene-benzoxazolyl- 2') 2-methylene-indoline,

1,3,3-triethyl-5-benzoxazolyl- 2' -2-methylene-indoline,

l-methyl-3 ,3-pentamethylene-S-benzoxazolyl- 2 -2- methylene-indoline,

1,3,3-t1'imethyl-5- [5 '-acetylamino-benzoxazolyl- (2) Z-methyIene-indoline,

1,3,3-trimethyl-5-oxazolo 5,4-d pyrimidine- (2 -2- methylene-indoline-w-aldehyde, 1,3,3-trimethyl-5-acenaphth(5,4-d)oxazoly1-(8')-2- methylene-indoline-w-aldehyde, 1,3,3-trimethyl-5-[1'-methyl-benzimidazolyl-(2') Z-methyIene-indoline-w-aldehyde, 1,3,3-trimethyl-5-[ l'- 3-cyanoethyl-5 '-methyl-benzimidazolyl- 2) ]-Z-methylene-indoline-w-aldehycle, 1,3,3-trimethyl-5- [5 -ethoxy- 1 -ethyl-benzimidazolyl- 2') ]-2-methylene-indoline-w-aldehyde, 1,3,3-trimethyl-5- 6'-methyl-benzthiazolyl- 2') ]-2- methylene-indoline-w-aldehyde, 1,3 ,3-trimethyl-5- 6'-methoxy-benzthiazolyl- 2) Z-methylene-indoline-w-aldehyde, 1,3 ,3-trimethyl-5- 5 '-chloro-benzthiazolyl (2') ]-2- methylene-indoline-w-aldehyde, 1-n-propyl-3 ,3-dimethyl-5- 5'-methyl-benz0xazolyl- (2') ]-Z-methylene-indoline-w-aldehyde, 1-n-butyl-3,3-dimethyl-5- 5'-methyl-benzoxazolyl- (2) ]-2-methylene-indoline-w-aldehyde, l-fl-cyanoethyl-B ,3 -dimethyl-5 5 '-methyl-benzoxazolyl- (2 -2-methylene-indoline-w-aldehyde, 1-methoxycarbonylmethyl-3,3-dimethyl-5- 5 -methylbenzoxazolyl- 2) ]-2-methylene-indoline-w-aldehyde, 1-fl-ethoxycarbonylethyl-3 3 -dimethyl-5 [5 '-methylbenzoxazolyl- 2) ]-2-methylene-indoline-w-aldehyde, 1-B-chloro-ethyl-3 ,3-dimethyl-5- [5'-methyl-benzoxazolyl- 2) ]-2-methylene-indoline-w-aldehyde, 1-allyl-3 ,3-dimethyl-5- 5'-methyl-'benzoxazolyl- (2') Z-methyIene-indOline-w-aldehyde, and 1-benzyl-3,3 -dimethy1-5- [5 '-methyl-benzoxazolyl- (2') ]-2-methylene-indoline-w-aldehyde.

Example 4a A mixture of 260 parts of 3-amino-4-hydroxy-toluene, 406 parts of 2,3,3-trimethyl-indolenine-S-carboxylic acid and parts of boric acid is heated for 1 hour to 180- 190" in a slight stream of nitrogen, whilst distilling oif some liquid, and is subsequently further heated to 240 for 40 minutes. Water and excess 3-amino-4-hydroxytoluene are then distilled off in a waterpump vacuum, under nitrogen, whilst increasing the internal temperature of the melt to 250. After cooling to 150 under niwith about 1000 parts 'by volume of chlorobenzene and then with 300 parts by volume of benzene, and is dried in vacuo at 50. 745 g. of quaternary salt of the formula (2a), of melting point 196-498", are obtained. These are suspended in 1700 parts by volume of dimethylformamide, whilst stirring. 181 parts of triethylamine are added dropwise at 20-25" under nitrogen, whilst cooling, whereupon the methylene base of the formula (3a) forms. The; mixture is then treated dropwise, at 20-55, with 400 parts of phosphorus oxychloride, Whilst stiring and cooltral and dried at 50 in vacuo. 540 parts of aldehyde of the formula (5a) are obtained, melting at 240242 after recrystallisation from dimethylformamide.

Example 1b 102 parts of 1,3,3-trimethyl-5-[5'-methyl-benzoxazolylin Example 3a), parts of cyanoacetic acid ethyl ester and 10 parts of piperidine in 800 parts by volume of ethanol are heated to the boil for 5 hours under reflux, whilst stirring, and are then cooled. The crystalline precipitate which separates out is filtered 01f, Washed with ice-cold methanol and dried at in vacuo. 120 parts of the compound of the formula trogen, 2800 parts by volume of chlorobenzene are added 45 and in order completely to remove the water azeotropical- N U3 UA 13, 200 Parts by volume of chlorobenzene are distilled off. U1 270 parts of dimethyl sulphate are subsequently added dropwise at -65", whilst occasionally cooling with cold U \O water. The batch is subsequently heated to 6065 for 50 \N C-OU a further 7 hours Whilst stirring, and is then cooled to room temperature. The crystalline precipitate is washed Us 0 TABLE 1 Colour shade on Number U1 U2 U3 U4 U5 U" polyamide 2b CH: H CH3 CH3 C2115 CH3 Grfiaenish-tinged 8 OW. 3b C1 H CH CH C2115 -CH CHz-OCH3 y Do.

4b 3 H CH3 CH3 CgHg, -CH2-CH2-CN DO.

5b Q H CH3 CH3 CH -CH -CH OH D0.

6b CH3O H CH3 CH3 CH3 /CH3 D0:

7b H orr o CH3 CH3 CH3 -oH2-oH2 -oH Do. 8)) Br H CH3 CH; CH3 CHzCH2Cl Do. 9b CH3 CH3 CIIQ CH3 CH3 CHgCH=CH2 D0. 10b H3)3c- H CH3 CH3 C113 -CHzCHz-CH2CH3 DO.

11b 1? H CH; CH CH CH3 Do.

-CH2--C 21 Example 2b An approximately 0.1% strength dyeing with dyestuif (1b) on plyamide-6 fabrics is produced as follows:

The fabric is introduced at 40, using a liquor ratio of 1:40 to 1:30, into a dyebath which contains the finely divided dyestulf and 1 g. per litre of a conventional anionic dispersing agent. The liquor temperature is raised to 98 (boiling point) over the course of 40 to 60 minutes, and is left at this temperature for about a further 60 minutes. Thereafter, the fabric is rinsed and dried. Strong greenishtinged yellow dyeings of high clarity and excellent fastness properties are obtained.

Dyeings with similar valuable properties are obtained if instead of the dyestuff of the formula (1b) one of the dyestuffs listed in Tables 1 and 2 of Example 1b are employed.

Example 3b An approximately 0.2% strength dyeing with dyestuff (2b) on polyethylene terephthalate fabric is produced as follows:

The fabric is introduced at 50, using a liquor ratio of 1:40, into a dyebath which contains the finely divided dyestulf, 1 g./l. of a conventional anionic dispersing agent, g./l. of o-cresotinic acid methyl ester and 1 g./l. of NaH PO and is adjusted to pH 4.5-5 with acetic acid. The temperature is raised to 80-85 over the course of 20 minutes and the bath is left in this temperature range for a further 20 minutes. Thereafter the liquor is gradually brought to the boil. After a period of boiling of about 1 hour, the dyeing process is complete. After rinsing and drying, greenish-tinged yellow dyeings of high clarity and very good fastness properties are obtained.

Example 4b An approximately 0.22% strength dyeing with dyestutf (lb) on cellulose triacetate fabric is produced in accordance with the method of dyeing indicated in Example 3b. The resulting strongly greenish-tinged dyeing displays high clarity and good fastness properties.

Example 5 b A knitted fabric of polyhexamethylenediamine adipate filaments is impregnated at room temperature with a solution which contains 6 parts of the dyestuif of the formula (10b) (Example 1b, Table l) and 7 parts of nonylphenolheptaglycolether in 989 parts of tetrachloroethylene. After squeezing out to a weight increase of 60%, the knitted fabric is dried for one minute at 80. Thereafter the dyestuff is fixed by heating the knitted fabric to 192 for 45 seconds. Small amounts of dyestufi which have not been fixed are then eluted by brief rinsing in cold tetrachloroethylene. After drying, a very clear, greenish-tinged yellow dyeing is obtained, which is distinguished by its high dyestuff yield, very good build-up and excellent fastness properties.

What is claimed is:

1. Azolindoline dyestuif of the formula wherein W is hydrogen, alkyl of 1-5 carbon atoms, trifluoromethyl, chloroethyl, bromoethyl, hydroxyethyl, methoxyethyl, cyclohexyl, phenyl, chloro, alkoxy of 1-5 carbon atoms, methylsulfonyl, ethylsulfonyl, dimethylaminosulfonyl, diethylaminosulfonyl, dimethylaminocarbonyl, diethylaminocarbonyl, methoxy-carbonyl, ethoxycarbonyl, [Si-methoxyethoxycarb0nyl, acetylamino, propionylamino, or methylsulfonylamino,

W is hydrogen, or alkyl of 1-5 carbon atoms,

W and W additionally can be joined together to produce a fused benzene ring,

R and R separately are methyl or ethyl, or can be joined together to produce a cyclopentyl or a cyclohexyl ring,

R is alkyl of 1-5 carbon atoms, chloroethyl, bromoethyl, fluoroethyl, cyanoethyl, allyl, methoxycarbonylethyl, benzyl, or phenylethyl,

R] is alkyl of 1-5 carbon atoms, chloroetryl, hydroxyethyl, methoxyethyl, cyanoethyl, allyl, benzyl or phenylethyl, and

X is oxygen or sulfur.

2. Dyestutf of Claim 1 wherein X is oxygen. 3. Dyestuff of Claim 1 wherein X is sulfur. 4. The compound of the formula N CH3 CH3 0 H: ON

\0 /-OHCH=C\ fi-O C211 5. The compound of the formula CH3 CH3 N 0 H3 CN \0 /CHOH=C N fi-OCHa References Cited UNITED STATES PATENTS 3,468,619 9/1969 Rave et al. 8-25 RAYMOND V. RUSH, Primary Examiner U.S. Cl. X.R.

26037 R, 37 N, 40 R, 240 I, 250 AC, 250 Q, 256.4 F, 256.5 R, 287 R, 288 R, 294.8 C, 295 B, 304, 309.2 

1. AZOLINDOLINE DYESTUFF OF THE FORMULA 